package com.tensquare.manager.filter;

import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import io.jsonwebtoken.Claims;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import util.JwtUtil;

import javax.servlet.http.HttpServletRequest;

@Component
public class ManagerFilter extends ZuulFilter {
    @Autowired
    private JwtUtil jwtUtil;
    //在请求前pre或者请求后post执行
    @Override
    public String filterType() {
        return "pre";
    }
    //多个过滤器的执行顺序，数字越小表示越先执行
    @Override
    public int filterOrder() {
        return 0;
    }
    //当前过滤器是否开启
    @Override
    public boolean shouldFilter() {
        return true;
    }
    //过滤器内执行操作，return 任何object的值都表示继续执行
    //里面有一个终止执行的方法，setSendZuulResponse(false)
    @Override
    public Object run() throws ZuulException {
        System.out.println("经过后台过滤器了");
        RequestContext requestContext=RequestContext.getCurrentContext();
        //首先获取request域
        HttpServletRequest request=requestContext.getRequest();
        if (request.getMethod().equals("OPTIONS")){
            return null;
        }
        if (request.getRequestURI().indexOf("login")>0){
            return null;
        }
        //得到头信息 进行验证
        String header=request.getHeader("Authorization");
        if (null!=header &&!"".equals(header)){
            if (header.startsWith("Bearer ")){
                String token="";
                try {
                    token=header.substring(7);
                    Claims claims=jwtUtil.parseJWT(token);
                    String roles=(String) claims.get("roles");
                    if (roles.equals("admin")){
                        //头信息转发下去，并且放行
                       requestContext.addZuulRequestHeader("Authorization",header);
                       return null;
                    }
                }catch (Exception e){
                     e.printStackTrace();
                     requestContext.setSendZuulResponse(false);
                }
            }
        }
        requestContext.setSendZuulResponse(false);
        requestContext.setResponseStatusCode(403);//权限不足
        requestContext.setResponseBody("权限不足");
        requestContext.getResponse().setContentType("text/html:charset=utf-8");
        return null;
    }
}
